Apparatus for the manufacture of metal grit.



APPARATUS FOR THE MANUFACTURE OF METAL GRIT.

APILIOATION FILED JUNE 28' 1909.

Patented Mar. 22, 1910.

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P. B. & W. MARTYN. APPARATUS FOR THE MANUFACTURE OF METAL GRIT.

APPLICATION FILED JUNE 28. 1909.

Patented Mar. 22, 1910.

2 SHEETS-SHEET 2.

' uesses:

PETER. BENNETT MARTYN AND WILLIAM MARTYN, 0F AIBDRIE, SCOTLAND.

APPARATUS FOR THE MANUFACTURE OF METAL GRIT.

Specification of Letters Patent.

Patented Mar. 22, 1910.

Application filed June 28, 1909. Serial No. 504,574.

To alt whom it may concern:

Be it known that we, PETER BENNETT MARTYN and VVILLIAM MARTYN, bothsubjects of the King of Great Britain, and both residing at Airdrie,Lanarkshire, Scotland, have invented certain new and useful Improvementsin Apparatus for the Manufacture of Metal Grit, of which the followingis a specification.

This invention relates to the manufacture of what is known as metal gritand which is at present used for various purposes.

By this invention tempered metal grit of superior quality can beproduced more cheaply than heretofore and, by using a standard grade ofpig iron, uniformity of quality can be insured. Further, we can readilymake the grit (within a certain range) to, practically speaking, apredetermined size or sizes. ,7

Under this invention the molten metal is conveyed to a trough orreceptacle from which it is delivered, through one or more openings in acolumn or series of columns said column or columns descending with auniform flow and coming in contact with a rotary divider having on it aseries of radial blades or teeth which cut the column or columns ofmolten metal into small pieces of a uniform size and throw or projectthem from the divider through one. or more parallel descending sheets ofwater thereby chilling and tempering the pieces which are allowed tocollect at the bottom of a water tank or hopper from which they can beremoved in any well known manner. Preferably we make the apparatus sothat several columns of molten metal are acted upon by the divider andthe particles cut from the columns are projected through severalparallel sheets of water. In order to keep the projections or teeth ofthe divider cool they are sprayed upon by a jet or jets of water whichis or are preferably projected upward from below. By varying the speedof the divider (or, alternatively varying the number of teeth or bladesthereon) and altering the size of the columns of molten metal, grit ofvarious sizes can be made: and, by altering the position of the watersheets relatively with the divider and increasing or diminishing thenumber thereof the temper given to the grit can be changed as desired.

In order that our invention may be clearly understood we. have hereuntoappended explanatory sheets of drawings whereon we have shown, by way ofexample, one form of apparatus made under our invention.

Figure l is a longitudinal section through the grit making apparatus.Fig. 2 is a plan view of the grit making apparatus. Fig. 3 is a crosssection on the line y, 7 Fig. 1. Fig. at is an enlarged sectional Viewof one of the divider blades. Fig. 5 is an enlarged sectional detail.

On the drawings the same reference letters wherever repeated indicatethe same parts.

The grit making apparatus shown in the drawings consists of a closedtank or hopper a, which is preferably made of cast iron and made with asloping bottom a which is preferably shaped to receive the foot b of theconveyer Z). At one end of the tank a and on the top thereof we providea box or receptacle 0 which is preferably made of cast iron suitablymolded and internally covered with some suitable material such asmolders sand so as to prevent the molten metal destroying the. metal ofthe box and which is made with a gateway through wiich the molten metalpasses to a box or receptacle (Z the bottom and side of which are moldedso as to direct the flow of the molten metal to a number of openings (Zthrough which the metal passes in columns. We may provide a trough 6above the box 0 the said trough 6 having a gateway 6 lead ing to the box0.

c an outlet valve which extends to near the top of the box 0 and whenthe molten metal rises in the box to near the top thereof it acts on thehead 0 and lifts the valve 0 off its seat thereby allowing metal to flowinto the box (Z and outlet (Z The molten metal in the box 0 will be keptat a constant height therein thereby insuring a uniform flow through theoutlets (Z for after the box 0 has been filled and the valve opened theoutflow of metal from the box will be auto matically replaced by freshmetal from the trough c.

Inunediatelv underneath the box (Z a rotary divider is provided andsuitably supported within the tank (4, its shaft 7' passing through thesides of the tank and any suitabte means is provided for driving thesame. In the apparatus shown on the drawings the shaft f is driven fromthe shaft 9 through sprocket wheels 9 and The divider f preferablyconsists of a metal drum f secured on the shaft 7 and having secured toand projecting radially from it a number of blades or teeth 7 which arepreferably made of angle section and each made with a groove 7 and sharpedge as shown in detail at Fig. 4. Each of these projecting blades orteeth f is removably secured to the drum f and the latter is preferablyprovided with a number of holes or slots whereby a varying number ofsuch projecting blades or teeth may be fitted thereon as, by so varyingthe number of blades or teeth the proportion of cuts for each rotationof the drum f may be varied as desired without varying the speed of thelatter, and, when it is desired to vary the number of cuts, it will begenerally found to be simpler and easier to change the number of theblades or teeth 011 the drum than to change the speed of the shaftcarrying it. The position of the divider f relative to the openings (Zat the bottom of the box (Z is such that, as the former rotates, theblades or teeth f thereon are one after the other, caused to cut throughthe columns of molten metal passing through the openings d each piececut off being of a size sufficient to make the size of grit required andthe pieces, after they are cutoff, are, by the force of the rotatingdrum 7, projected tangentially from the blades or teeth f thereon.

Above or on the top of the tank a we provide a water distributing box Ithaving a number of slotted apertures ill in the bottom thereof. Thebreadth of each of the apertures h in the bottom of the box it iscapable of adjustment and, when desired, they may be closed by means ofvalves b actuated by a lever h and rod h. lVater is supplied to the box72, from any convenient source of supply, or from a storage tank throughpipes h and enters the box through inlets 71. and when the valves ]L2are open the water will pass from the distributing box in a series ofvertical and parallel sheets, passing to the water filled lower part ofthe tank a from which, if desired, the water may be returned to thestorage tank and waste thereby prevented. The pieces of molten metalprojected from the blades f of the drum pass through the vertical andparallel sheets of water and they are chilled and tempered when passingtherethrough and, as finished grit of uniform size or sizes, theyfinally drop down into the water filled lower portion of the tank a;from which the finished grit may be taken out in any convenient manner,as, for instance, by means of the conveyer b.

In order to keep the blades or teeth f of the divider f cool and toprevent the molten metal injuring them, they are sprayed upon by a waterjet (or jets) from a pipe situated underneath the divider, the jet, orjets of water being projected upward on to each blade or tooth f as itrotates, causingit to carry a film of water until it cuts through themolten metal and this watercooling of the blades or teeth of the divideris carried on so long as the apparatus is in use.

By altering the size of the openings (Z in the bottom of the box (Z andby altering the speed of the divider f and adjusting the position of thevertical sheets of water relatively to the divider, the size or sizesand temper of the grit obtained may be altered to suit the purpose forwhich it is required.

To enable the sheets of water to be adjusted relatively to the divider,the box 72. is made adjustable in position and the water is suppliedthereto by means of flexible pipe connections.

0 are removable plates.

79 is a water outlet valve.

Having now fully described our invention what we claim and desire tosecure by Letters Patent is 1. An apparatus for the manufacture of metalgrit comprising, in combination, means for delivering the molten metalin one or more columns, a rotary divider for cutting the metal intosmall pieces and a device for supplying vertical and parallel sheets ofwater through which the metal pieces are projected by the divider forthe purpose of chilling and tempering the same.

2. An apparatus for the manufacture of metal grit comprising, incombination, means for delivering the molten metal in a regular flow,means for dividing the same into a number of columns, means for dividingthe columns into small particles of a uniform size and means forsupplying vertical and parallel sheets of water through which the metalpieces are projected by the dividing means.

3. An apparatus for the manufacture of metal grit comprising, incombination, means for delivering the molten metal in columns, a rotarydivider provided with radial blades for cutting the metal columns intopieces of uniform size, a device for supplying vertical and parallelsheets of water through which the metal pieces are projected by thedivider, said device being adjustable relatively with the divider.

4:. An apparatus for the manufacture of metal grit comprising, incombination, means for delivering the molten metal in columns, a rotarydivider provided with radial blades for cutting the metal columns intopieces of uniform size, a device for supplying vertical and parallelsheets of water through which the metal pieces are projected by thedivider, and means arranged within the said device for regulating theflow of the water.

5. An apparatus for the manufacture of metal grit comprising, incombination, means for delivering the molten metal uniformly in one ormore columns, rotary means for cutting the column or columns intoparticles of uniform size and projecting them forward, a Water sprayacting on the said rotary means to cool the same, and a device forsupplying one or more sheets of water.

6. An apparatus for the manufacture of metal. grit comprising, incombination, a trough for the molten metal, means for delivering themolten metal uniformly from the said trough in one or more columns, arotary device provided with radial blades for cutting the columns intopieces of uniform size, means for spraying water on to the blades ofsaid rotary device, a device to which water is supplied having openingsin its bottom through which the water can pass in descending sheets andmeans for regulating the size of or closing the said openings,

7. An apparatus for the manufacture of metal grit comprising, incombination, a trough to which molten metal is supplied, a chamber belowthe trough into which the molten metal runs .and which has an outlet anda self acting valve controlling said outlet, a receptacle below theoutlet which is provided with a series of openings from which the moltenmetal can flow in columns, a rotary divider provided with a series ofradial blades for cutting the columns into pieces of uniform size, meansfor spraying water on to the blades of said rotary device and a devicefor supplying water in one or more vertical sheets.

8. An apparatus for the manufacture of metal grit comprising, incombination, a trough to which molten metal is supplied, a chamber belowthe trough into which the molten metal runs and having an outlet and ase f acting valve controlling said outlet, a receptacle below the outletwhich is provided with a series of openings from which the molten metalcan flow in columns, a rotary divider having blades the points of wiiehare curved for cutting the columns into pieces of uniform size, meansfor spraying'water on to the blades of said rotary device and a devicefor supplying water in one or more vertical sheets.

9. An apparatus for the manufacture of metal grit comprising, incombination, a water tank, a receiver for molten metal arranged thereon,means for causing the molten metal to flow from the said receiveruniformly in columns, rotary means for dividing the columns of moltenmetal in particles of uniform size and projecting them tangentially,means for supplying a series of vertical and parallel sheets of Water,means for allowing the water to overflow from the tank and conveyermeans for raising the particles from the tank and discharging the same.

10. An apparatus for the manufacture of metal grit comprising, incombination, a water tank, a receiver for molten metal arranged thereon,means for causing the molten metal to flow from the said receiveruniformly in columns, a rotary divider having a series of radial bladeseach of which is curved at its outer extremity and terminates in a sharpedge, means for spraying water on to the blades, means for supplying aseries of vertical and parallel sheets of water, means for allowing thewater to overflow from the tank and conveyer means for raising theparticles from the tank and discharging the same.

In testimony whereof we aliix our signatures in presence of twowitnesses.

PETER BENNETT MART YN. lVILLliAM lw JIARTYN.

lVitnesses H. D. FITZPATRIOK, GEORGE l/VOLFE BRUCE.

